If your house has notoriously cold spots during winter, or uncomfortably warm rooms in summer — even when your HVAC is working fine — the culprit may be your ductwork.Twists and turns in ducts, along with long spans of ductwork, conspire to restrict air flow. While some parts of your house seem cozy, others may suffer from a lack of heated or cooled air from your HVAC system.The problem is usually worse in older homes with ducts that weren’t designed to handle modern heating and cooling systems.How Booster Fans HelpBooster fans are add-ons that help move air through ducts. While inline duct and register booster fans will not cure underlying defects, they can “boost” air flow, thus increasing the amount of cold and warm air that ultimately makes it to a room.First, Check the BasicsInspect your HVAC system for problems that might be contributing to airflow and efficiency problems. Dirty filters, peeling duct tape, and obstructed air returns all can decrease HVAC performance.Types of HVAC Booster FansRegister booster fans are the most economical and simplest to install.

These plug-and-play units replace your existing floor, wall, or ceiling register. They mount flush to the surface, plug into the wall outlet, and feature a modest internal fan that goes on and off when the HVAC system kicks in. Some feature a thermostat and multi-speed fan.Prices range from $30 for a basic unit up to $80 for those with digital thermostats, multi-speed fans, and remote control.Inline duct fans are cylindrical fans that replace a section of ductwork. That means your HVAC ducting must be exposed to work on it. Though some units simply plug in, most are hardwired and require a relay back to the furnace that tells the unit when to switch on. Installation may require an electrician.Inline duct fans are quieter than register booster fans, but you’ll have to know the size and shape of your existing ductwork so you can pick the right-sized unit. Count on paying $30 to $200 for an inline booster fan, plus a couple hundred dollars for the electrician.A Word of Caution From a Pro“The biggest challenge is the return air — getting the stale air from the second or third floor back down to the furnace to be heated or cooled and redistributed,” explains Tom Hutchinson, president of Hutchinson Plumbing Heating Cooling. 

“While cost-effective, we don’t see that booster fans provide a whole lot of success in remedying the problem,” explains Hutchinson. “The best solution is adding returns or installing a thermostatically controlled zone system.”Related: How to Fix Your AC to Last Through the SummerDo You Really Need to Clean Your Air Ducts? 34 used & new from Sold by etailz and Fulfilled by Amazon. Heating & Air Conditioning BoosterDetailsDeflecto Magnetic Vent Cover, 5" x 12", 3 Pack (MVCX512) Add-on ItemFREE Shipping on orders over $49. best wall mounted air conditioning unitDetailsDeflecto Model 50 Premium Unbreakable Air Deflector Add-on ItemFREE Shipping on orders over $49. ac unit is clicking Air Flow Breeze ULTRA with Remote Control (Almond) (2.625"H x 13.875"W x 7.625"D)ac and furnace systems

The AirFlow Breeze Home Heating/Cooling System (Brown) (Fits 4"W x 10"L opening) VenTech VT DF-6 DF6 Duct Fan, 240 CFM, 6" Depending on the season, lowering or raising your thermostat just 4° can cost an additional 5 to 0 per month. Running a booster over the same period costs about 60 cents! Just place over standard 12” x 6” floor register and plug into a 110V outlet. 12 x 6 x 3 inches #23,109 in Home Improvements (See top 100) #89 in Home Improvement > Building Supplies > HVAC > Ventilation Fans #141 in Home Improvement > Kitchen & Bath Fixtures > Bathroom Fixtures > Bathroom Fixture Accessories 5.5 pounds (View shipping rates and policies) See all 196 customer reviews See all 196 customer reviews (newest first) Works great, I was skeptical at first as some A/C boosters have a tendency to kick on in the middle of the night and startle me awake, but this one is quiet enough where I do not... Bought for a stand-by spare. Have three in use at all times.

I don't think it pulled any more air. It seems like it should work but, no. The third night it woke me up making plasticky humming sounds, had to shut it off. I will return it. I purchased one of these years ago and it was the best item ever, I was so happy to find them here on Amazon and so purchased three of them and so happy I did... works really good on my 3rd floor where for some reason my ac won't work. Excellent choice for wall mounted vents received the product earlier than expected which was great. It doesn't move enough air, very weak motor. brings down the temperature in my bedroom enough to make it comfortable. It is a little noisy but creates a white noise Suncourt HC500-B Flush Fit Brown Register Booster Suncourt Flush Fit Register Air Booster Fan - White Cyclone 9004151 Automatic Register Booster Fan, CM-300w, Steel, White Suncourt Brown Flush Fit Register Air Booster Fan w/ Brown Flush Fit Mount Adaptor See and discover other items: floor outlet covers

Flush Fit Register Booster Fan in White Saves energy and money Works automatically with forced air systems The Suncourt Flush Fit Heating and Air Conditioning Register Booster helps boost air that has been heated or cooled from under-performing registers in your home. This register booster features a built-in temperature sensor. The booster is made of high-impact, ABS-polycarbonate with a flame-retardant housing. This register booster is an energy efficient way to improve circulation and comfort in your home. The Flush Fit Register Booster's quiet 3-speed; dual fans pull extra air out of weak registers, boosting airflow by up to 85%. Fits in a standard 4 in. by 10 in. register; adaptor plate, model HC5PL1-W, sold separately for sizes 6 x 10 in., 6 x 12 in. and 4 x 12 in. Low voltage, safe for children and pets Push button function controls Engineered for maximum airflow 3 Can i use this fan to the register on the wall ? 2 How do you set temperature on this fan